second vector
DESCRIPTION
COLLISION AVOIDANCE MANEUVER (Method I)TRANSCRIPT
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Enav222 midterm lessons
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METHOD I (PROCEDURES)
ALTER COURSE AND MAINTAIN SPEED
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SITUATION: Our ship is on Course 0000 T speed 11 knots.
Our radar is set on 12 mile scale. A contact is observed as follows:
TIME BEARING RANGE 0603 0600 11 miles 0609 0590 9.5
miles 0615 0580 8.0
miles
CHANGE OF COURSE
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Find: RCPA TC TCPA TS MCPA Target Aspect MRM DRM SRM
PART 1-
PLOTTING THE 1ST VECTOR (e-r-m)
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Oc=0000
OS=11knots
R
M1/0603M2/0609
M3/0615
Tdiff.= 12 minSpd=11kts.
Dist= 2.2miles
RML
X
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2.2
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Find: RCPA TC TCPA TS MCPA Target Aspect MRM DRM SRM
END of PART 1-
PLOTTING THE 1ST VECTOR (e-r-m)
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PART 2-Plotting the 2nd Vector (e-r1-m)
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MX BMX TMX RMX NDRM NSRM NTCPA NBCPA NRCPA
Find and Plot the ff:
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2.2
e
rm
MX
NRML
NDRM
3miles6miles
WHAT WILL BE OWN SHIP’S NEW COURSE?
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2.2
e
rm
MX
NRML
NDRM
NRM & RL
r1
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e
rm
MX
NRML
NDRM
NRM & RL
r1
NCo
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e
rm
MX
NRML
NDRM
NRM & RL
r1
Nco=054o
RML
DRM
R
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MX BMX TMX RMX NDRM NSRM NTCPA NBCPA NRCPA
Find and Plot the ff:
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Of change course problems
END
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METHOD II (PROCEDURES)
MAINTAIN COURSE AND ALTER SPEED
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Own ship’s course could be changed to either
054o or 294o . However, there is a reef to starboard and three ships to port that prevent either course changes.
Required: What other course of action could be taken? Answer: Reduce speed = 5.2knots
CHANGE SPEED PROBLEMS
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e
rm
MX
NRML
NDRM
NRM & RLr1
RML
DRM
R
Spd.reduce to 5.2kts.
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METHOD III (PROCEDURES)
ALTER COURSE AND ALTER SPEED
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Instead of continuing own ship at the speed of
11 knots and instead of changing course to either 054o or 294o we decide to increase speed to 15 knots.
Required: What course change will have to be made so that at 15 knots, the CPA will continue to be 3 miles?
Answer: 065oT
CHANGE OF SPEED AND COURSE PROBLEM
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Tdiff.= 12 min
Spd=15kts.
Dist= 3.0miles
r
em
MX
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3milesr1
e
NRM & RL
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r1
e
NRM & RLmMX
r
NRML
NDRM
NCO=065O
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HOW TO PLOT NEW COURSE
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r1
e
NRM & RLmMX
r
NRML
NDRM
NCO=065O
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END